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Filter Envelope
Dave Smith Instruments
Filter Envelope
The Prophet Rev2 filter has a dedicated, five-stage envelope generator
(DADSR). The Filter Envelope is used to shape the harmonic charac-
teristics of a synthesized sound by giving you filtering control over its
attack, decay, sustain, and release stages (plus a delay parameter to delay
the onset of the envelope).
This is one of the most important aspects of designing a sound. Without
an envelope, the filters would be completely static. They would stay open
or closed by a fixed amount that wouldn’t change over the duration of a
sound. That’s not very interesting to listen to and it’s not how instruments
behave in the real world.
In general, sounds produced by an instrument are brighter at their begin-
ning (the attack stage) and grow mellower as they die out (the decay and
release stages). In other words, their harmonic content changes over time.
This is exactly what the filter envelope is designed to emulate.
CUTOFF
RESONANCE
ENV AMOUNT
VELOCITY
KEY AMOUNT
AUDIO MOD
4 POLE
DELAY
ATTACK
DECAY
SUSTAIN
RELEASE
LOW-PASS FILTER
Filter Envelope
Attack
Decay
Sustain
Release
Delay
Amplitude
Time
note on
note off
A typical 5-stage DADSR envelope
Summary of Contents for Prophet Rev2
Page 1: ...8 16 Voice Polyphonic Synthesizer...
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Page 21: ...11 Prophet Rev2 User s Guide Getting Started...